drivers/media/video/saa7134/saa7134-empress.c

   1 /*
   2  *
   3  * (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19
  20 #include <linux/init.h>
  21 #include <linux/list.h>
  22 #include <linux/module.h>
  23 #include <linux/moduleparam.h>
  24 #include <linux/kernel.h>
  25 #include <linux/slab.h>
  26 #include <linux/delay.h>
  27
  28 #include "saa7134-reg.h"
  29 #include "saa7134.h"
  30
  31 #include <media/saa6752hs.h>
  32
  33 /* ------------------------------------------------------------------ */
  34
  35 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
  36 MODULE_LICENSE("GPL");
  37
  38 static unsigned int empress_nr[] = {[0 ... (SAA7134_MAXBOARDS - 1)] = UNSET };
  39
  40 module_param_array(empress_nr, int, NULL, 0444);
  41 MODULE_PARM_DESC(empress_nr,"ts device number");
  42
  43 static unsigned int debug = 0;
  44 module_param(debug, int, 0644);
  45 MODULE_PARM_DESC(debug,"enable debug messages");
  46
  47 #define dprintk(fmt, arg...)    if (debug)                      \
  48         printk(KERN_DEBUG "%s/empress: " fmt, dev->name , ## arg)
  49
  50 /* ------------------------------------------------------------------ */
  51
  52 static void ts_reset_encoder(struct saa7134_dev* dev)
  53 {
  54         if (!dev->empress_started)
  55                 return;
  56
  57         saa_writeb(SAA7134_SPECIAL_MODE, 0x00);
  58         msleep(10);
  59         saa_writeb(SAA7134_SPECIAL_MODE, 0x01);
  60         msleep(100);
  61         dev->empress_started = 0;
  62 }
  63
  64 static int ts_init_encoder(struct saa7134_dev* dev)
  65 {
  66         ts_reset_encoder(dev);
  67         saa7134_i2c_call_clients(dev, VIDIOC_S_MPEGCOMP, NULL);
  68         dev->empress_started = 1;
  69         return 0;
  70 }
  71
  72 /* ------------------------------------------------------------------ */
  73
  74 static int ts_open(struct inode *inode, struct file *file)
  75 {
  76         int minor = iminor(inode);
  77         struct saa7134_dev *h,*dev = NULL;
  78         struct list_head *list;
  79         int err;
  80
  81         list_for_each(list,&saa7134_devlist) {
  82                 h = list_entry(list, struct saa7134_dev, devlist);
  83                 if (h->empress_dev && h->empress_dev->minor == minor)
  84                         dev = h;
  85         }
  86         if (NULL == dev)
  87                 return -ENODEV;
  88
  89         dprintk("open minor=%d\n",minor);
  90         err = -EBUSY;
  91         if (down_trylock(&dev->empress_tsq.lock))
  92                 goto done;
  93         if (dev->empress_users)
  94                 goto done_up;
  95
  96         dev->empress_users++;
  97         file->private_data = dev;
  98         err = 0;
  99
 100 done_up:
 101         up(&dev->empress_tsq.lock);
 102 done:
 103         return err;
 104 }
 105
 106 static int ts_release(struct inode *inode, struct file *file)
 107 {
 108         struct saa7134_dev *dev = file->private_data;
 109
 110         if (dev->empress_tsq.streaming)
 111                 videobuf_streamoff(&dev->empress_tsq);
 112         down(&dev->empress_tsq.lock);
 113         if (dev->empress_tsq.reading)
 114                 videobuf_read_stop(&dev->empress_tsq);
 115         videobuf_mmap_free(&dev->empress_tsq);
 116         dev->empress_users--;
 117
 118         /* stop the encoder */
 119         ts_reset_encoder(dev);
 120
 121         up(&dev->empress_tsq.lock);
 122         return 0;
 123 }
 124
 125 static ssize_t
 126 ts_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
 127 {
 128         struct saa7134_dev *dev = file->private_data;
 129
 130         if (!dev->empress_started)
 131                 ts_init_encoder(dev);
 132
 133         return videobuf_read_stream(&dev->empress_tsq,
 134                                     data, count, ppos, 0,
 135                                     file->f_flags & O_NONBLOCK);
 136 }
 137
 138 static unsigned int
 139 ts_poll(struct file *file, struct poll_table_struct *wait)
 140 {
 141         struct saa7134_dev *dev = file->private_data;
 142
 143         return videobuf_poll_stream(file, &dev->empress_tsq, wait);
 144 }
 145
 146
 147 static int
 148 ts_mmap(struct file *file, struct vm_area_struct * vma)
 149 {
 150         struct saa7134_dev *dev = file->private_data;
 151
 152         return videobuf_mmap_mapper(&dev->empress_tsq, vma);
 153 }
 154
 155 /*
 156  * This function is _not_ called directly, but from
 157  * video_generic_ioctl (and maybe others).  userspace
 158  * copying is done already, arg is a kernel pointer.
 159  */
 160 static int ts_do_ioctl(struct inode *inode, struct file *file,
 161                        unsigned int cmd, void *arg)
 162 {
 163         struct saa7134_dev *dev = file->private_data;
 164
 165         if (debug > 1)
 166                 saa7134_print_ioctl(dev->name,cmd);
 167         switch (cmd) {
 168         case VIDIOC_QUERYCAP:
 169         {
 170                 struct v4l2_capability *cap = arg;
 171
 172                 memset(cap,0,sizeof(*cap));
 173                 strcpy(cap->driver, "saa7134");
 174                 strlcpy(cap->card, saa7134_boards[dev->board].name,
 175                         sizeof(cap->card));
 176                 sprintf(cap->bus_info,"PCI:%s",pci_name(dev->pci));
 177                 cap->version = SAA7134_VERSION_CODE;
 178                 cap->capabilities =
 179                         V4L2_CAP_VIDEO_CAPTURE |
 180                         V4L2_CAP_READWRITE |
 181                         V4L2_CAP_STREAMING;
 182                 return 0;
 183         }
 184
 185         /* --- input switching --------------------------------------- */
 186         case VIDIOC_ENUMINPUT:
 187         {
 188                 struct v4l2_input *i = arg;
 189
 190                 if (i->index != 0)
 191                         return -EINVAL;
 192                 i->type = V4L2_INPUT_TYPE_CAMERA;
 193                 strcpy(i->name,"CCIR656");
 194                 return 0;
 195         }
 196         case VIDIOC_G_INPUT:
 197         {
 198                 int *i = arg;
 199                 *i = 0;
 200                 return 0;
 201         }
 202         case VIDIOC_S_INPUT:
 203         {
 204                 int *i = arg;
 205
 206                 if (*i != 0)
 207                         return -EINVAL;
 208                 return 0;
 209         }
 210         /* --- capture ioctls ---------------------------------------- */
 211
 212         case VIDIOC_ENUM_FMT:
 213         {
 214                 struct v4l2_fmtdesc *f = arg;
 215                 int index;
 216
 217                 index = f->index;
 218                 if (index != 0)
 219                         return -EINVAL;
 220
 221                 memset(f,0,sizeof(*f));
 222                 f->index = index;
 223                 strlcpy(f->description, "MPEG TS", sizeof(f->description));
 224                 f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 225                 f->pixelformat = V4L2_PIX_FMT_MPEG;
 226                 return 0;
 227         }
 228
 229         case VIDIOC_G_FMT:
 230         {
 231                 struct v4l2_format *f = arg;
 232
 233                 memset(f,0,sizeof(*f));
 234                 f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 235
 236                 saa7134_i2c_call_clients(dev, cmd, arg);
 237                 f->fmt.pix.pixelformat  = V4L2_PIX_FMT_MPEG;
 238                 f->fmt.pix.sizeimage    = TS_PACKET_SIZE * dev->ts.nr_packets;
 239                 return 0;
 240         }
 241
 242         case VIDIOC_S_FMT:
 243         {
 244                 struct v4l2_format *f = arg;
 245
 246                 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 247                     return -EINVAL;
 248
 249                 saa7134_i2c_call_clients(dev, cmd, arg);
 250                 f->fmt.pix.pixelformat  = V4L2_PIX_FMT_MPEG;
 251                 f->fmt.pix.sizeimage    = TS_PACKET_SIZE* dev->ts.nr_packets;
 252                 return 0;
 253         }
 254
 255         case VIDIOC_REQBUFS:
 256                 return videobuf_reqbufs(&dev->empress_tsq,arg);
 257
 258         case VIDIOC_QUERYBUF:
 259                 return videobuf_querybuf(&dev->empress_tsq,arg);
 260
 261         case VIDIOC_QBUF:
 262                 return videobuf_qbuf(&dev->empress_tsq,arg);
 263
 264         case VIDIOC_DQBUF:
 265                 return videobuf_dqbuf(&dev->empress_tsq,arg,
 266                                       file->f_flags & O_NONBLOCK);
 267
 268         case VIDIOC_STREAMON:
 269                 return videobuf_streamon(&dev->empress_tsq);
 270
 271         case VIDIOC_STREAMOFF:
 272                 return videobuf_streamoff(&dev->empress_tsq);
 273
 274         case VIDIOC_QUERYCTRL:
 275         case VIDIOC_G_CTRL:
 276         case VIDIOC_S_CTRL:
 277                 return saa7134_common_ioctl(dev, cmd, arg);
 278
 279         case VIDIOC_S_MPEGCOMP:
 280                 saa7134_i2c_call_clients(dev, VIDIOC_S_MPEGCOMP, arg);
 281                 ts_init_encoder(dev);
 282                 return 0;
 283         case VIDIOC_G_MPEGCOMP:
 284                 saa7134_i2c_call_clients(dev, VIDIOC_G_MPEGCOMP, arg);
 285                 return 0;
 286
 287         default:
 288                 return -ENOIOCTLCMD;
 289         }
 290         return 0;
 291 }
 292
 293 static int ts_ioctl(struct inode *inode, struct file *file,
 294                      unsigned int cmd, unsigned long arg)
 295 {
 296         return video_usercopy(inode, file, cmd, arg, ts_do_ioctl);
 297 }
 298
 299 static struct file_operations ts_fops =
 300 {
 301         .owner    = THIS_MODULE,
 302         .open     = ts_open,
 303         .release  = ts_release,
 304         .read     = ts_read,
 305         .poll     = ts_poll,
 306         .mmap     = ts_mmap,
 307         .ioctl    = ts_ioctl,
 308         .llseek   = no_llseek,
 309 };
 310
 311 /* ----------------------------------------------------------- */
 312
 313 static struct video_device saa7134_empress_template =
 314 {
 315         .name          = "saa7134-empress",
 316         .type          = 0 /* FIXME */,
 317         .type2         = 0 /* FIXME */,
 318         .hardware      = 0,
 319         .fops          = &ts_fops,
 320         .minor         = -1,
 321 };
 322
 323 static void empress_signal_update(void* data)
 324 {
 325         struct saa7134_dev* dev = (struct saa7134_dev*) data;
 326
 327         if (dev->nosignal) {
 328                 dprintk("no video signal\n");
 329                 ts_reset_encoder(dev);
 330         } else {
 331                 dprintk("video signal acquired\n");
 332                 if (dev->empress_users)
 333                         ts_init_encoder(dev);
 334         }
 335 }
 336
 337 static void empress_signal_change(struct saa7134_dev *dev)
 338 {
 339         schedule_work(&dev->empress_workqueue);
 340 }
 341
 342
 343 static int empress_init(struct saa7134_dev *dev)
 344 {
 345         int err;
 346
 347         dprintk("%s: %s\n",dev->name,__FUNCTION__);
 348         dev->empress_dev = video_device_alloc();
 349         if (NULL == dev->empress_dev)
 350                 return -ENOMEM;
 351         *(dev->empress_dev) = saa7134_empress_template;
 352         dev->empress_dev->dev     = &dev->pci->dev;
 353         dev->empress_dev->release = video_device_release;
 354         snprintf(dev->empress_dev->name, sizeof(dev->empress_dev->name),
 355                  "%s empress (%s)", dev->name,
 356                  saa7134_boards[dev->board].name);
 357
 358         INIT_WORK(&dev->empress_workqueue, empress_signal_update, (void*) dev);
 359
 360         err = video_register_device(dev->empress_dev,VFL_TYPE_GRABBER,
 361                                     empress_nr[dev->nr]);
 362         if (err < 0) {
 363                 printk(KERN_INFO "%s: can't register video device\n",
 364                        dev->name);
 365                 video_device_release(dev->empress_dev);
 366                 dev->empress_dev = NULL;
 367                 return err;
 368         }
 369         printk(KERN_INFO "%s: registered device video%d [mpeg]\n",
 370                dev->name,dev->empress_dev->minor & 0x1f);
 371
 372         videobuf_queue_init(&dev->empress_tsq, &saa7134_ts_qops,
 373                             dev->pci, &dev->slock,
 374                             V4L2_BUF_TYPE_VIDEO_CAPTURE,
 375                             V4L2_FIELD_ALTERNATE,
 376                             sizeof(struct saa7134_buf),
 377                             dev);
 378
 379         empress_signal_update(dev);
 380         return 0;
 381 }
 382
 383 static int empress_fini(struct saa7134_dev *dev)
 384 {
 385         dprintk("%s: %s\n",dev->name,__FUNCTION__);
 386
 387         if (NULL == dev->empress_dev)
 388                 return 0;
 389         flush_scheduled_work();
 390         video_unregister_device(dev->empress_dev);
 391         dev->empress_dev = NULL;
 392         return 0;
 393 }
 394
 395 static struct saa7134_mpeg_ops empress_ops = {
 396         .type          = SAA7134_MPEG_EMPRESS,
 397         .init          = empress_init,
 398         .fini          = empress_fini,
 399         .signal_change = empress_signal_change,
 400 };
 401
 402 static int __init empress_register(void)
 403 {
 404         return saa7134_ts_register(&empress_ops);
 405 }
 406
 407 static void __exit empress_unregister(void)
 408 {
 409         saa7134_ts_unregister(&empress_ops);
 410 }
 411
 412 module_init(empress_register);
 413 module_exit(empress_unregister);
 414
 415 /* ----------------------------------------------------------- */
 416 /*
 417  * Local variables:
 418  * c-basic-offset: 8
 419  * End:
 420  */